FYI

262

Water Make-Up Requirements of Cooling Towers

Model shown: TC-135F

Evaporative cooling towers, like the ADVANTAGE Power Tower® Series, provide cooling by evaporating a small amount of the recirculated process water flow. Approximately 1,000 BTU’s
are required to evaporate .12 gallons of water. Therefore, every tower ton (15,000 BTU/hr) requires approximately 1.8 gallons of water evaporation, or .03 gpm/ton.

As water evaporates in a cooling tower system, the water vapor enters the atmosphere while any dissolved solids remain behind, building concentration in the remaining water.

Most water treatment systems control this concentration by bleeding off the high concentration water, which is made up by fresh city water with a lower solid concentration. The amount of water that is
bled off by the water treatment system is usually less than or equal to the amount of water that evaporates.

Therefore, the maximum normal water makeup for a cooling tower system is .06 gpm / ton, or about 2% of the nominal tower flow rate.

The following chart specifies the Maximun Water Make Up requirement per model.

ADVANTAGE MODEL #

TOWER CAPACITY

MAXIMUM EVAPORATION

NOMINAL TOWER FLOW RATE

MAXIMUM WATER MAKE-UP

Power Tower Series

Expressed in Tons

At Designed Capacity Shown in GPM

Shown in GPM

At Designed Capacity Shown in GPM

TC-45F

45

1.35

135

2.7

TC-85F

85

2.55

255

5.1

TC-105F

105

3.15

315

6.3

TC-135F

135

4.05

405

8.1

TC-170F

170

5.10

510

10.2

TC-210F

210

6.30

630

12.6

TC-270F

270

8.10

810

16.2

TC-405F

405

12.15

1,215

24.5

TC-540F

540

16.20

1620

32.4

For more information about water make-up requirements and cooling tower systems call the Advantage Sales Department at 317-887-0729.